Robert Boschgmbh

Saab-scania Ab

Ingolf Grauel

Werner Stumpe

Gunter Kulke

Egbert Muller

Gerald Hofer

Franz Maurer

Hakan Samuelson

Eric Thoms

A multiple-circuit brake system for motor vehicles in which a multiple-circuit braking value transducer is embodied partially electrically and partially as a pneumatic control valve and is intended for triggering pressure control valves, the wheel brake cylinders being disposed following these pressure control valves. One pressure-medium reservoir is associated with each pressure control valve, and the controlling energy for each of these pressure control valves is drawn from the pressure-medium reservoir associated with that valve. In the pneumatic brake circuit (I), a further pressure-medium reservoir is provided preceding the braking value transducer, as a result of which it is possible, with the aid of two-way check valves, to actuate the wheel brake cylinders with the pneumatic brake circuit (I) whenever the electrical brake circuits (II, III) have failed.

Multiple-circuit brake system

A dual-circuit pressure medium brake system is equipped with relay valves disposed ahead of the brake cylinders. Each brake circuit is equipped with a control also acting in the other circuit and overlapping each other, and a primary brake circuit is designed in such a way that it contains all control elements necessary for optimal brake pressure adaptation, while a secondary brake circuit is merely an auxiliary brake circuit without control elements. In this manner each brake pressure metering can be simultaneously adjusted. During the loss of the primary brake circuit, the secondary brake circuit guarantees a minimal brake pressure. Such a pressure medium brake system is preferably used in air brake systems of motor vehicles.

Dual-circuit pressure medium brake system

A tractor-trailer braking system with a control valve for the trailer which is controllable by at least two service brake circuits of the tractor. One circuit of this multi-circuit control has an electrical control in the form of magnetic valves, or the like, in order to speed up the control process. The system may be combined with a load-dependent switching element and/or with an anti-skid protection-dependent switching element.

Tractor-trailer brake system including a trailer brake control valve

A pressure-medium brake system, which comprises multiple circuits and has associated with each brake cylinder or group of brake cylinders relay valves which are controllable by a control medium. Depending on the number of brake circuits and the kind of the respective control medium, the relay valves are provided with several, possibly different, control chambers. This results in an overlapping control which insures that each relay valve can even be controlled in the event that a control circuit has been lost. The brake system is preferably used in utility vehicles equipped with air brakes.

Dual control pressure medium brake system

A brake system for combinations of vehicles in which a truck tractor and/or trailer (semi-trailer) is or are equipped with a supplementary electrical brake system. By the particular embodiment of the brake system, it is possible to couple a truck tractor, with or without an electrical brake system, to a trailer, with or without an electrical brake system, without infringing safety regulations.

Brake system for vehicle combinations

A pressure medium brake system for motor vehicles is proposed in which a high-pressure-producing apparatus and a normal-pressure brake apparatus are provided. The brake pressure is reduced with the aid of pressure limiters from high pressure to normal pressure. In order to attain rapid filling of the brake cylinders, one relay valve is disposed before each group of brake cylinders, the relay valves being triggered with normal pressure and very rapidly directing the high pressure into the brake cylinders with a large pressure drop. Upon attaining the maximum pressure level of the normal pressure, the supply of high pressure in the relay valve is cut off. The pressure medium brake system is preferably used as a compressed-air brake system for trucks and trailer-trucks.

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Vaihingenenz, Germany

Ingolf Grauel